The utility model discloses a railway railway roadbed stiffness detection device, include: the crossbeam, it has a vertical plane of symmetry, first connecting piece, its detachably is connected to the intermediate position of crossbeam, a pair of string of pincers, its detachably is connected to first connecting piece, and a pair of string of pincers for the plane of symmetry symmetric distribution, the lower extreme of hanging pincers has hook portion, and the hook portion of a pair of string of pincers is relative each other, a pair of second connecting piece, detachably connects respectively the both ends of crossbeam. Railway railway roadbed stiffness detection device connect the intermediate position at the crossbeam with first connecting piece detachably, be connected to first connecting piece with a pair of string of pincers detachably again, the 2nd coupling part cloth is at the both ends of crossbeam. During the use, assemble the convenience, detection efficiency is high.